Hello @PieterP,
thanks for helping out again with this issue. I tried without the delay part but the module still acts in a temperamental way: sometimes it shows up, other times it doesn't, unexpectedly. I wonder if it is the quality of the serial-to-USB onboard microchip.
I was double-checking the compatibility chart.
It seems that the board ESP32 3S NANO has not been tested yet.
The Arduino ESP32 is on the list.
The ESP32 3S is on the list too.
However, the ESP32 3S Nano (from Waveshare) is NOT on the list.
Waveshare claims that the ESP32 3S Nano is compatible with the Arduino Nano ESP32, but there are some differences.
The Arduino Nano ESP32 uses the same 3S microchip but for example pins B0 and B1 are wired in a different way).
Also, IDE's tools menu for the Arduino Nano is very basic and intuitive. On the contrary the ESP32 menu looks extremely complex, probably for expert users or developers (which is not my case).
Am I saying gibberish or probably the difference of cost would justify (again) the reliability of a module?
Arduino ESP32 Nano: £18
Waveshare ESP 3S Nano: £8
Thank you guys